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[程序员] 请教 10M 级别设备在线状态的最佳设计

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需要查询设备是否在线，上次在线时间。

我初步的想法是单独维护一个在线服务，不依赖 redis ，设备离线才写数据库。

想请问大家有没有经验介绍。

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